I have a big and massive problem.

So in 9th i had taken hindi as my subject. but i realised i SUCK at it and in 10th i cant even cross 55/80 and regret taking hindi instead of sanskrit. So as 10th is almost over, if i really grind and study, can i cover 2 years of sanskrit in a month or two and take sanskrit in 11th and make a comeback?
extra details, - in 8th i used to get above average - topper ish marks 80% ish marks in sanskrit without putting much effort.